valkyrjaio / sindri-java / 27855701989

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[Tests] Add per-class tests for full coverage (#25)

# Description

Brings the Sindri test suite up to the same standard and organization as
the Valkyrja Java repo: one dedicated `<Class>Test` per code-bearing
class, license header, `io.sindri.unit.<ns>` packages mirroring the
source tree, and explicit imports. Line coverage goes from 62.54% → 100%
(993/993, no exclusions). `Sindri.main` is exercised under
`Exiter.freeze()` against `valkyrja:26.1.1`, whose `Exiter` fix prevents
the test JVM from exiting.

Mockito was added to the JUnit build (same versions as Valkyrja) to mock
framework contracts. The big generator/AST orchestration
(`GenerateDataFromAst`, `GenerateDataFromConfigCommand`, `ConfigReader`)
is covered end-to-end by an integration test that writes a
self-consistent, package-correct mini-app into a `@TempDir` and runs the
real generator, asserting the four `App*Data.java` files are produced —
keeping all generated output inside the temp dir.

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## Types of Changes

- [x] Improvement _(non-breaking change which improves code)_
- [ ] Bug fix _(non-breaking change which fixes an issue)_
- [ ] New feature _(non-breaking change which adds functionality)_
- [ ] Deprecation _(breaking change which removes functionality)_
- [ ] Breaking change _(fix or feature that would cause existing
functionality to change)_
- [ ] Documentation improvement

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## Changes

- **`.github/ci/junit/build.gradle.kts`** — added `mockito-core` /
`mockito-junit-jupiter` (`5.14.2`); bumped `io.valkyrja:valkyrja` to
`26.1.1`
- **`build.gradle.kts`** /
**`.github/ci/{spotbugs,errorprone,archunit}/build.gradle.kts`** —
bumped `io.valkyrja:valkyrja` to `26.1.1` for consistency
- **`.github/ci/junit/src/test/java/io/sindri/unit/**`** — added
dedicated per-class tests for all previously-untested code-bearing
classes: 7 exceptions, the `GenerateStatus` enum, both constant holders,
8 data records, 8 result records (incl. `merge()`), 5 AST readers,
`ConfigReader`, `FileGener... (continued)

257 of 282 branches covered (91.13%)

Branch coverage included in aggregate %.

993 of 993 relevant lines covered (100.0%)

4.2 hits per line